Question

выполните действия.Пж помогите

Answer 1

$\frac{3}{5a} - \frac{5}{4a} = \frac{3 \times 4 - 5 \times 5}{20a} = \frac{12 - 25}{20a} = - \frac{13}{20a}$

$\frac{14a - 9}{17a} + \frac{3a - 25}{17a} = \frac{14a - 9 + 3a - 25}{17a} = \frac{17a - 24}{17a}$

$\frac{ab + ab}{ab {}^{2} } \times \frac{a {}^{2} b}{3a + 3b} = \frac{2ab \times {a}^{2}b }{ab {}^{2}(3a + 3b) } = \frac{2 {a}^{2} }{3a + 3b}$